How good are most pills good for? 1 yr? Ibuprofen 800?

The shelf-life has to be written/mentioned on the label it is the law, usually meds are good to be used within the expiry date, which is ascertained from the date of manufacturing; which could be 2 or 3 years.

You should use them within one year, I definitely would not go way too over that unless a pharmacist or doctor says it is okay.

Over time, medications change their chemical structure and say you have ibuprofen now and keep it for four years, its chemical structure may have changed and not be as effective or do something else negative.

Take care.-